Display panel with different pixel density and display device

ABSTRACT

A display panel and a display device are provided in the present disclosure. The display panel includes first pixels and second pixels, and further includes a display region including an optical component region and a regular display region. First light-emitting elements are in the optical component region; second light-emitting elements are in the regular display region; and a density of the light-emitting elements in the optical component region is less than a density of the light-emitting elements in the regular display region. The first pixels include first blue pixels, first red pixels, and first green pixels; a width-to-length ratio of a first drive transistor corresponding to a first blue pixel is R1, a width-to-length ratio of a first drive transistor corresponding to a first red pixel is R2, and a width-to-length ratio of a first drive transistor corresponding to a first green pixel is R3, where R1&gt;R2&gt;0 and/or R1&gt;R3&gt;0.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority of Chinese Patent Application No.202010738054.3, filed on Jul. 28, 2020, the content of which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The present disclosure generally relates to the field of displaytechnology and, more particularly, relates to a display panel and adisplay device.

BACKGROUND

With the continuous development of display technology, consumers mayhave growing requirements for display panels. Various display panels,such as liquid crystal display panels, organic light-emitting displaypanels, and the like, have developed rapidly. Accordingly, 3D display,touch display, curved display, ultra-high-resolution display, andanti-peep display are emerging to meet consumer's needs.

In addition to information display functions, appearance requirements ofdisplay panels have gradually increased in recent years. Largerscreen-to-body ratio is the future market trend. Display panels withunder-screen camera structures are favored by consumers. In the displaypanel with an under-screen camera structure, a camera is disposed underthe display region of the display panel, and light passes through thedisplay region of the display panel and is incident on the camera,thereby capturing pictures by the camera. However, disposing theunder-screen camera structure in the display panel may worsen thedisplay effect of the display panel.

SUMMARY

One aspect of the present disclosure provides a display panel. Thedisplay panel includes a plurality of pixels, including first pixels andsecond pixels, where a first pixel includes a first light-emittingelement and a first pixel circuit, connected to each other; the firstpixel circuit includes a first drive transistor; a second pixel includesa second light-emitting element and a second pixel circuit, connected toeach other; and the second pixel circuit includes a second drivetransistor. The display panel further includes a display region,including an optical component region and a regular display region,where the first light-emitting element is in the optical componentregion; the second light-emitting element is in the regular displayregion; a density of the light-emitting element in the optical componentregion is less than a density of the light-emitting element in theregular display region. The first pixels include first blue pixels,first red pixels, and first green pixels; a width-to-length ratio of afirst drive transistor corresponding to a first blue pixel is R1, awidth-to-length ratio of a first drive transistor corresponding to afirst red pixel is R2, and a width-to-length ratio of a first drivetransistor corresponding to a first green pixel is R3, where R1>R2>0and/or R1>R3>0.

Another aspect of the present disclosure provides a display device,including a display panel. The display panel includes a plurality ofpixels, including first pixels and second pixels, where a first pixelincludes a first light-emitting element and a first pixel circuit,connected to each other; the first pixel circuit includes a first drivetransistor; a second pixel includes a second light-emitting element anda second pixel circuit, connected to each other; and the second pixelcircuit includes a second drive transistor. The display panel furtherincludes a display region, including an optical component region and aregular display region, where the first light-emitting element is in theoptical component region; the second light-emitting element is in theregular display region; a density of the light-emitting element in theoptical component region is less than a density of the light-emittingelement in the regular display region. The first pixels include firstblue pixels, first red pixels, and first green pixels; a width-to-lengthratio of a first drive transistor corresponding to a first blue pixel isR1, a width-to-length ratio of a first drive transistor corresponding toa first red pixel is R2, and a width-to-length ratio of a first drivetransistor corresponding to a first green pixel is R3, where R1>R2>0and/or R1>R3>0.

Other aspects of the present disclosure can be understood by thoseskilled in the art in light of the description, the claims, and thedrawings of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain the embodiments of the presentdisclosure or the technical solutions in the related technology, thedrawings required for describing the embodiments or the relatedtechnology are briefly introduced hereinafter. Obviously, the drawingsin the following description are merely embodiments of the presentdisclosure. Other drawings may also be obtained by those skilled in theart without any creative work according to provided drawings.

FIG. 1 illustrates a structural schematic of a display panel accordingto an embodiment of the present disclosure;

FIG. 2 illustrates a structural schematic of a display device accordingto an embodiment of the present disclosure;

FIG. 3 illustrates a structural schematic of another display panelaccording to an embodiment of the present disclosure;

FIG. 4 illustrates a structural schematic of a pixel circuit accordingto an embodiment of the present disclosure;

FIG. 5 illustrates a time sequence diagram according to an embodiment ofthe present disclosure;

FIG. 6 illustrates a structural schematic of another pixel circuitaccording to an embodiment of the present disclosure;

FIG. 7 illustrates another time sequence diagram according to anembodiment of the present disclosure;

FIG. 8 illustrates a structural schematic of another display panelaccording to an embodiment of the present disclosure;

FIG. 9 illustrates a structural schematic of a transistor channelaccording to an embodiment of the present disclosure;

FIG. 10 illustrates a structural schematic of another transistor channelaccording to an embodiment of the present disclosure; and

FIG. 11 illustrates a structural schematic of another display deviceaccording to an embodiment of the present disclosure.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present disclosure aredescribed clearly and completely in conjunction with the drawings in theembodiments of the present disclosure. Obviously, the describedembodiments are merely a part of the embodiments of the presentdisclosure, but not all the embodiments.

As mentioned in the background, in addition to information displayfunctions, appearance requirements of display panels have graduallyincreased in recent years. Larger screen-to-body ratio is the futuremarket trend. Display panels with under-screen camera structures arefavored by consumers. In the display panel with an under-screen camerastructure, a camera is disposed under the display region of the displaypanel, and light passes through the display region of the display paneland is incident on the camera, thereby capturing pictures by the camera.However, disposing the under-screen camera structure in the displaypanel may worsen the display effect of the display panel.

The embodiments of the present disclosure provide a display panel and adisplay device, which may effectively solve the technical problems inthe related technology and improve the chromaticity uniformity of thedisplay panel at an optical component region, thereby improving thedisplay effect of the display panel.

In order to achieve the above-mentioned objectives, the technicalsolutions provided by the embodiments of the present disclosure aredescribed in detail with reference to FIGS. 1 to 11.

FIG. 1 illustrates a structural schematic of a display panel accordingto an embodiment of the present disclosure. The display panel providedby the embodiments of the present disclosure may include a plurality ofpixels, including first pixels and second pixels. The first pixel mayinclude a first light-emitting element 110 and a first pixel circuit120, connected to each other; and the first pixel circuit 120 mayinclude a first drive transistor. The second pixel may include a secondlight-emitting element 210 and a second pixel circuit 220, connected toeach other; and the second pixel circuit 220 may include a second drivetransistor.

The display panel may further include a display region, including anoptical component region 101 and a regular display region 102. The firstlight-emitting element 110 may be in the optical component region 101,and the second light-emitting element 210 may be in the regular displayregion 102. The density of the light-emitting element in the opticalcomponent region 101 may be less than the density of the light-emittingelement in the regular display region 102.

The first pixels may include first blue pixels b1, first red pixels r1,and first green pixels g1. The width-to-length ratio of the first drivetransistor corresponding to the first blue pixel b1 is R1, thewidth-to-length ratio of the first drive transistor corresponding to thered pixel r1 is R2, and the width-to-length ratio of the first drivetransistor corresponding to the first green pixel g1 is R3, whereR1>R2>0 and/or R1>R3>0.

It should be noted that optical components, such as a camera and thelike, may be disposed at the optical component region provided by theembodiments of the present disclosure, which may not be limitedaccording to the embodiments of the present disclosure and may bedesigned based on actual applications. As the structural schematic ofthe display device shown in FIG. 2, the display device may include adisplay panel 1 and an optical device 2. The display panel 1 may includethe optical component region 101. The optical device 2 may be disposedat the non-light-exiting side of the display panel 1 and correspondinglydisposed at the optical component region 101. Optionally, the opticaldevice 2 may be a camera.

It should be understood that the display region of the display panelprovided by the embodiments of the present disclosure may include theoptical component region and the regular display region, and the opticalcomponent region and the regular display region may both includelight-emitting elements, which may make the area of the display regionlarger to meet the trend of full-screen display. Moreover, at theoptical component region provided by the embodiments of the presentdisclosure, the width-to-length ratio of the first drive transistorcorresponding to the first blue pixel may be greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst red pixel, and/or the width-to-length ratio of the first drivetransistor corresponding to the first blue pixel may be greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst green pixel. That is, at the optical component region provided bythe embodiments of the present disclosure, the width-to-length ratio ofthe first drive transistor corresponding to the first blue pixel may begreater than the width-to-length ratio of the first drive transistorcorresponding to the first red pixel; or, at the optical componentregion provided by the embodiments of the present disclosure, thewidth-to-length ratio of the first drive transistor corresponding to thefirst blue pixel may be greater than the width-to-length ratio of thefirst drive transistor corresponding to the first green pixel; or at theoptical component region provided by the embodiments of the presentdisclosure, the width-to-length ratio of the first drive transistorcorresponding to the first blue pixel may be greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst red pixel, and the width-to-length ratio of the first drivetransistor corresponding to the first blue pixel may greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst green pixel. Furthermore, by using the manner of increasing thewidth-to-length ratio of the first drive transistor corresponding to thefirst blue pixel, the luminous efficiency of the first blue pixel may beimproved, thereby achieving the purpose of improving the chromaticityuniformity of the display panel at the optical component region andfurther improving the display effect of the display panel.

For example, the calculation formula of the saturation region current Iof a transistor is:

I=(½)Un*Cox*(W/L)*(|Vgs|−|Vth|)2;

where Un is the electron mobility of the transistor channel, Cox is thecapacitance of the gate oxide layer per unit area of the transistor, W/Lis the channel width-to-length ratio of the transistor, Vgs is thegate/source voltage of the transistor, and Vth is the threshold voltageof the transistor. According to the calculation formula of thesaturation region current I of the transistor, it may be seen thatincreasing the width-to-length ratio W/L of the transistor may increasethe saturation region current I of the transistor and further improvethe luminous efficiency of the light-emitting element electricallyconnected to the transistor. The test data of the transistor is shown inthe following Table 1.

TABLE 1 W/L width-to-length ratio (unit of the channel width and length,um) Current I Working region  3/30  74 nA Saturation region 12/22 298 nASaturation region 17/13 299 nA Saturation region

It may be seen from Table 1 that when the width-to-length ratio of thetransistor is larger, the current is larger when working in thesaturation region. The test data of the color shift value of differentdisplay pictures of the display panel is shown in the following Table 2.As shown in Table 2, in a control 1, the width-to-length ratios of thedrive transistors corresponding to the blue pixel, the red pixel, andthe green pixel in Table 2 is 3 μm/19.435 μm; and in a control 2, thewidth-to-length ratios of the drive transistors corresponding to the redpixel and the green pixel is 3 μm/19.435 μm, and the width-to-lengthratio of the drive transistor corresponding to the blue pixel is 3 μm/12μm.

TABLE 2 Color shift value Color shift value Display picture of control 1of control 2 32 grayscale white picture 0.0110 0.00091 64 grayscalewhite picture 0.0089 0.00067 127 grayscale white picture 0.0075 0.00053255 grayscale white picture 0.0067 0.00051 255 grayscale white picture0.0049 0.00015 255 grayscale white picture 0.0034 0.00014 255 grayscalewhite picture 0.0056 0.00022

It may be seen from Table 2 that when the width-to-length ratio of thedrive transistor corresponding to the blue pixel is larger, the colorshift value of the picture displayed by the display panel may decrease.Therefore, it may be known that, by combining the experimental data inTable 1 and Table 2, the luminous efficiency of the first light-emittingelement corresponding to the first blue pixel may be improved on thebasis of increasing the width-to-length ratio of the first drivetransistor corresponding to the first blue pixel in the embodiments ofthe present disclosure. In addition, on the basis of improving theluminous efficiency of the first light-emitting element corresponding tothe first blue pixel, the objective of improving the chromaticityuniformity of the display panel at the optical component region may beachieved, thereby improving the display effect of the display panel.

In one embodiment of the present disclosure, 2≤R1/R2≤4, 2≤R1/R3≤4 isprovided by the present disclosure. That is, any ratio of thewidth-to-length ratios between the width-to-length ratio R1 of the firstdrive transistor corresponding to the first blue pixel and each of thewidth-to-length ratio R2 of the first drive transistor corresponding tothe first red pixel and the width-to-length ratio R3 of the drivetransistor corresponding to the first green pixel may not be less than 2and not be more than 4 according to the embodiments of the presentdisclosure. Moreover, according to the embodiments of the presentdisclosure, the channel width of the first drive transistorcorresponding to the first red pixel is W2, the channel width of thefirst drive transistor corresponding to the first green pixel is W3, thechannel length of the first drive transistor corresponding to the firstred pixel is L2, and the channel length of the first drive transistorcorresponding to the first green pixel is L3, where |W2-W3|≤0.5 μm,|L2-L3|≤0.5 μm. By optimizing the ratio limitation of thewidth-to-length ratios and the size limitation of the first drivetransistors respectively corresponding to the first blue pixel, thefirst red pixel, and the first green pixel, it may ensure highchromaticity uniformity of the display panel at the optical componentregion.

As shown in FIG. 1, the first light-emitting element 110 and the firstpixel circuit 120 provided by the embodiments of the present disclosuremay be both disposed at the optical component region 101. Or, the firstlight-emitting element provided by the embodiments of the presentdisclosure may be disposed in the optical component region, and thefirst pixel circuit connected to the first light-emitting element may bedisposed in the regular display region. Referring to FIG. 3, the displaypanel provided by the embodiments of the present disclosure may includethe display region. The display area may include the optical componentregion 101 and the regular display region 102. The first light-emittingelement 110 may be located in the optical component region 101. However,the first pixel circuit 120 connected to the first light-emittingelement 110 may be located outside the optical component region 101,which may further increase the light-transmitting area of the opticalcomponent region and ensure high effect of the elements of the displaypanel disposed at the optical component region. Optionally, the firstpixel circuit 120 connected to the first light-emitting element 110 maybe located between the regular display region 102 and the opticalcomponent region 101.

The pixel drive circuit provided by the embodiments of the presentdisclosure may be electrically connected to the light-emitting element(e.g., the first pixel drive circuit may be electrically connected tothe first light-emitting element, and the second pixel drive circuit maybe electrically connected to the second light-emitting element). Inaddition to including the drive transistor, the pixel drive circuit mayalso include a plurality of other transistors and capacitors. All of thetransistors and capacitors may cooperate with each other to provide adrive current to the light-emitting element, and then the light-emittingelement may emit light in response to the drive current. The circuitcomposition of the first pixel drive circuit and the second pixel drivecircuit provided by the embodiments of the present disclosure may besame. FIG. 4 illustrates a structural schematic of a pixel circuitaccording to an embodiment of the present disclosure. The pixel drivecircuit may include a drive transistor T0, and a reset module 10, a datawrite module 20, a light-emitting control module 30 and a storage module40 which are electrically connected to the drive transistor T0. Thereset module 10 may be configured to transmit a first reference voltageVref1 to the gate electrode of the drive transistor T0 to reset the gateelectrode potential of the drive transistor T0; the data write module 20may be configured to write the data voltage Vdata into the firstterminal of the drive transistor T0; the light-emitting control module30 may be configured to transmit the drive current generated by thedrive transistor T0 to the light-emitting element 50, which makes thelight-emitting element 50 emit light in response to the drive current;and the storage module 40 may be configured to maintain the voltage atthe gate electrode of the drive transistor T0. Optionally, the displaypanel provided by the embodiments of the present disclosure may be anorganic light-emitting display panel. Optionally, the transistorsprovided in the embodiments of the present disclosure may all bethin-film transistors.

As shown in FIG. 4, the reset module 10 provided by the embodiments ofthe present disclosure may include a reset transistor T1. The firstterminal of the reset transistor T1 may be connected to the firstreference voltage Vref1, the gate electrode of the reset transistor T1may be electrically connected to a first control signal S1, and thesecond terminal of the reset transistor T1 may be electrically connectedto the gate electrode of the drive transistor T0. The data write module20 may include a first data write transistor T2 and a second data writetransistor T3. The gate electrodes of the first data write transistor T2and the second data write transistor T3 may both be electricallyconnected to a second control signal S2. The first terminal of the firstdata write transistor T2 may be connected to the data voltage Vdata, andthe second terminal of the first data write transistor T2 may beelectrically connected to the first terminal of the drive transistor T0.The first terminal of the second data write transistor T3 may beelectrically connected to the gate electrode of the drive transistor T0,and the second terminal of the second data write transistor T3 may beelectrically connected to the second terminal of the drive transistorT0. The light-emitting control module 30 may include a firstlight-emitting control transistor T4 and a second light-emitting controltransistor T5. The gate electrodes of the first light-emitting controltransistor T4 and the second light-emitting control transistor T5 mayboth be electrically connected to a third control signal S3. The firstterminal of the first light-emitting control transistor T4 may beconnected to a first voltage V1, and the second terminal of the firstlight-emitting control transistor T4 may be electrically connected tothe first terminal of the drive transistor T0. The first terminal of thesecond light-emitting control transistor T5 may be electricallyconnected to the second terminal of the drive transistor T0, the secondterminal of the second light-emitting control transistor T5 may beelectrically connected to the first terminal of the light-emittingelement 50, and the second terminal of the light-emitting element 50 maybe connected to a second voltage V2. The storage module 40 may include astorage capacitor C, the first terminal of the storage capacitor C maybe connected to the first voltage V1, and the second terminal of thestorage capacitor C may be electrically connected to the gate electrodeof the drive transistor T0.

As shown in FIGS. 4-5, FIG. 5 illustrates a time sequence diagramaccording to an embodiment of the present disclosure. In the embodimentsof the present disclosure, all transistors of the pixel circuits areP-type as an example for description (e.g., the transistor is inconduction when the control signal connected to the gate electrode ofthe transistor is a low level, and the transistor is cutoff when thecontrol signal connected to the gate electrode of the transistor is ahigh level). The working process of the pixel drive circuit provided bythe embodiments of the present disclosure may include a reset stage M1,a data write stage M2, and a light-emitting stage M3, which aresequentially performed.

At the reset stage M1, the reset transistor T1 is in conduction totransmit the first reference voltage Vref1 to the gate electrode of thedrive transistor T0. At this point, the transistors of the data writemodule 20 and the light-emitting control module 30 may both be cutoff.The first reference voltage Vref1 may be a voltage capable ofcontrolling the conduction of the drive transistor T0.

At the data write stage M2, the transistor of the light-emitting controlmodule 30 and the reset transistor T1 may both be cutoff, and the firstdata write transistor T2 and the second data write transistor T3 may bein conduction. The first data write transistor T2 may output the datavoltage Vdata to the first terminal of the drive transistor T0, and thesecond data write transistor T3 may connect the gate electrode with thesecond terminal of the drive transistor T0.

At the light-emitting stage M3, the transistor of the data write module20 and the reset transistor T1 may both be cutoff, and the firstlight-emitting control transistor T4 and the second light-emittingcontrol transistor T5 may be in conduction. In such way, the path forthe first voltage V1, the first light-emitting control transistor T4,the drive transistor T0, the second light-emitting control transistorT5, the light-emitting element 50, and the second voltage V2 may beformed; the drive current generated by the drive transistor T0 may betransmitted to the light-emitting element 50; and the light-emittingelement 50 may emit light in response to the drive current.

Furthermore, the pixel circuit provided by the embodiments of thepresent disclosure may further include a black state maintaining module.FIG. 6 illustrates a structural schematic of another pixel circuitaccording to an embodiment of the present disclosure. The pixel circuitmay further include a black state maintaining module 60 electricallyconnected to the light-emitting element. The black state maintainingmodule 60 may be configured to transmit the second reference voltageVref2 to the light-emitting element 50, thereby controlling thelight-emitting element 50 outside the light-emitting stage to maintainthe black state to be off. For example, as shown in FIG. 6, the blackstate maintaining module 60 provided by the embodiments of the presentdisclosure may include a black state maintaining transistor T6. The gateelectrode of the black state maintaining transistor T6 may beelectrically connected to a fourth control signal S4, the first terminalof the black state maintaining transistor T6 may be connected to thesecond reference signal Vref2, and the second terminal of the blackstate maintaining transistor T6 may be electrically connected to thefirst terminal of the light-emitting element 50. The pixel circuit shownin FIG. 6 of the present disclosure may include the reset stage M1, thedata write stage M2, and the light-emitting stage M3 which are same asthe pixel circuit shown in FIG. 4. FIG. 7 illustrates another timesequence diagram according to an embodiment of the present disclosure.At the reset stage M1 and the data write stage M2, the black statemaintaining transistor T6 may be controlled to be in conduction by thefourth control signal S4; furthermore, the black state maintainingtransistor T6 may transmit the second reference voltage Vref2 to thefirst terminal of the light-emitting element 50, thereby controlling thelight-emitting element 50 to maintain the black state to be off, whichmay avoid the black state to be not dark at the reset stage and the datawrite stage. At the light-emitting stage M3, the black state maintainingtransistor T6 may be controlled to be cutoff by the fourth controlsignal S4, thereby ensuring the light-emitting element 50 to emit lightnormally.

It should be noted that the circuit connection structure of theabove-mentioned pixel circuit may not be limited in the embodiments ofthe present disclosure, and other circuit connection structures may alsobe used in other embodiments of the present disclosure. The drivetransistor, the reset transistor, the data write transistor, thelight-emitting control transistor, and the black state maintainingtransistor provided by the embodiments of the present disclosure may allbe P-type thin-film transistors; or the drive transistor, the resettransistor, the data write transistor, the light-emitting controltransistor, and the black state maintaining transistor provided by theembodiments of the present disclosure may all be N-type thin-filmtransistors; the first voltage provided by the embodiments of thepresent disclosure may be the voltage provided by the anode voltageterminal, and the second voltage may be the voltage provided by thecathode voltage terminal; and the light-emitting element may be alight-emitting diode, and the like, which not be limited according to anembodiment of the present disclosure.

Furthermore, the configuration of the transistors, storage capacitorsand the like in the first pixel circuit and/or the second pixel circuitmay be further optimized to improve the performance of the pixel circuitand the display effect of the display panel. For example, the firstpixel circuit provided by the embodiments of the present disclosure mayinclude the reset module, the data write module, and the light-emittingcontrol module which are electrically connected to the first drivetransistor. The reset module may include at least one reset transistorelectrically connected to the first drive transistor. The data writemodule may include at least one data write transistor electricallyconnected to the first drive transistor. The light-emitting controlmodule may include at least one light-emitting control transistorelectrically connected to the first drive transistor. Thewidth-to-length ratio of the light-emitting control transistorcorresponding to the first pixel circuit provided in the embodiments ofthe present disclosure may be greater than each of width-to-lengthratios of the reset transistor and the data write transistor in a samefirst pixel circuit.

Moreover, the first pixel circuit provided by the embodiments of thepresent disclosure may further include the black state maintainingmodule electrically connected to the first light-emitting element. Theblack state maintaining module may include at least one black statemaintaining transistor electrically connected to the firstlight-emitting element. The width-to-length ratio of the light-emittingcontrol transistor corresponding to the first pixel circuit may begreater than the width-to-length ratio of the black state maintainingtransistor in a same first pixel circuit.

It should be understood that the light-emitting control module providedby the embodiments of the present disclosure may be configured tocontrol the drive current generated by the first drive transistor to betransmitted to the first light-emitting element; furthermore, thelight-emitting device may emit light in response to the drive current.The light-emitting control transistor of the light-emitting controlmodule may be connected in series with the first drive transistor, suchthat the current transmitted by the light-emitting control transistormay be relatively large. In the embodiments of the present disclosure,by setting the width-to-length ratio of the light-emitting controltransistor in the first pixel circuit to be larger than thewidth-to-length ratios of the reset transistor, the data writetransistor and the black state maintaining transistor in the first pixelcircuit, the stability of the light-emitting control transistor and thefirst pixel circuit may be improved. Optionally, the width-to-lengthratio of the light-emitting control transistor corresponding to thefirst pixel circuit provided by the embodiments of the presentdisclosure may be R_(k), where 4≤R_(k)≤6.

In one embodiment of the present disclosure, the width-to-length ratioof the light-emitting control transistor corresponding to the first bluepixel provided by the embodiments of the present disclosure may beR_(k)1; the width-to-length ratio of the light-emitting controltransistor corresponding to the first red pixel provided by theembodiments of the present disclosure may be R_(k)2; and thewidth-to-length ratio of the light-emitting control transistorcorresponding to the first green pixel provided by the embodiments ofthe present disclosure may be R_(k)1. When R1>R2>0, R_(k)1>R_(k)2>0; andwhen R1>R3>0, R_(k)1>R_(k)3>0.

It should be understood that, according to the embodiments of thepresent disclosure, the width-to-length ratio of the first drivetransistor corresponding to the first blue pixel may be greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst red pixel, and/or the width-to-length ratio of the first drivetransistor corresponding to the first blue pixel may be greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst green pixel. Furthermore, when the width-to-length ratio of thefirst drive transistor corresponding to the first blue pixel is greaterthan the width-to-length ratio of the first drive transistorcorresponding to the first red pixel, the width-to-length ratio of thelight-emitting control transistor corresponding to the first blue pixelmay be set to be larger than the width-to-length ratio of thelight-emitting control transistor corresponding to the first red pixel;and when the width-to-length ratio of the first drive transistorcorresponding to the first blue pixel is greater than thewidth-to-length ratio of the first drive transistor corresponding to thefirst green pixel, the width-to-length ratio of the light-emittingcontrol transistor corresponding to the first blue pixel may be set tobe larger than the width-to-length ratio of the light-emitting controltransistor corresponding to the first green pixel, which may enable thelight-emitting control transistor corresponding to the first blue pixelto transmit a larger current and further improve the stability of thefirst pixel circuit corresponding to the first blue pixel.

In one embodiment of the present disclosure, the first pixel circuitprovided by the present disclosure may include a first storage capacitorelectrically connected to the gate electrode of the first drivetransistor; the second pixel circuit may include a second storagecapacitor electrically connected to the gate electrode of the seconddrive transistor; and the capacitance of the first storage capacitor maybe greater than the capacitance of the second storage capacitor.

It should be understood that the light-emitting element density at theregular display region provided by the embodiments of the presentdisclosure may be greater than the light-emitting element density at theoptical component region. In order to improve the display brightness atthe optical component region, it is necessary to increase the drivecurrent generated by the first drive transistor, and the objective ofimproving the luminous efficiency of the first light-emitting elementmay be achieved by increasing the drive current. That is, under thecondition of a same grayscale and a same color pixel, the ratio of thedrive current of the first light-emitting element to the drive currentof the second light-emitting element may be the ratio of thelight-emitting element density at the regular display region to thelight-emitting element density at the optical component region.Furthermore, the capacitance of the first storage capacitor provided bythe embodiments of the present disclosure is set to be larger than thecapacitance of the second storage capacitor, which may ensure that thefirst storage capacitor has a high potential maintaining capacity forthe gate electrode of the first drive transistor, and further ensurehigh stability of the first pixel circuit on the basis of ensuring highuniformity of the overall brightness of the display panel. Optionally,according to the embodiments of the present disclosure, the capacitanceof the first storage capacitor is C1, and the capacitance of the secondstorage capacitor is C2, where 2≤C1/C2≤4.

In one embodiment of the present disclosure, as shown in FIG. 1, thesecond pixels provided by the present disclosure may include second bluepixels b2, second red pixels r2, and second green pixels g2. Thewidth-to-length ratio of the second drive transistor corresponding tothe second blue pixel b2 is R1′, the width-to-length ratio of the seconddrive transistor corresponding to the second red pixel r2 is R2′, andthe width-to-length ratio of the second drive transistor correspondingto the second green pixel is R3′, where R1′>R2′>0 and/or R1′>R3′>0.

It should be understood that in the regular display region provided bythe embodiments of the present disclosure, the width-to-length ratio ofthe second drive transistor corresponding to the second blue pixel maybe greater than the width-to-length ratio of the second drive transistorcorresponding to the second red pixel, and/or the width-to-length ratioof the second drive transistor corresponding to the second blue pixelmay be greater than the width-to-length ratio of the second drivetransistor corresponding to the second green pixel. That is, in theregular display region provided by the embodiments of the presentdisclosure, the width-to-length ratio of the second drive transistorcorresponding to the second blue pixel may be greater than thewidth-to-length ratio of the second drive transistor corresponding tothe second red pixel; or in the regular display region provided by theembodiments of the present disclosure, the width-to-length ratio of thesecond drive transistor corresponding to the second blue pixel may begreater than the width-to-length ratio of the second drive transistorcorresponding to the second green pixel; or in the regular displayregion provided by the embodiments of the present disclosure, thewidth-to-length ratio of the second drive transistor corresponding tothe second blue pixel may be greater than the width-to-length ratio ofthe second drive transistor corresponding to the second red pixel, andthe width-to-length ratio of the second drive transistor correspondingto the second blue pixel may be greater than the width-to-length ratioof the second drive transistor corresponding to the second green pixel.Furthermore, by increasing the width-to-length ratio of the second drivetransistor corresponding to the second blue pixel, the luminousefficiency of the second blue pixel may be improved, and the objectiveof improving the chromaticity uniformity of the display panel in theregular display region may be achieved, which may ensure highchromaticity uniformity of the display panel in the regular displayregion and the optical component region and further improve the displayeffect of the display panel. Optionally, according to the embodiments ofthe present disclosure, the channel width of the second drive transistorcorresponding to the second red pixel is W2′, the channel width of thesecond drive transistor corresponding to the second green pixel is W3′,the channel length of the second drive transistor corresponding to thesecond red pixel is L2′, and the channel length of the second drivetransistor corresponding to the second green pixel is L3′, where|W2′-W3′|≤0.5 μm, and |L2′-L3′|≤0.5 μm.

Further, when R1′>R2′>0, the width-to-length ratio of the light-emittingcontrol transistor of the second blue pixel may be greater than thewidth-to-length ratio of the light-emitting control transistor of thesecond red pixel; and when R1′>R3′>0, the width-to-length ratio of thelight-emitting control transistor of the second blue pixel may begreater than the width-to-length ratio of the light-emitting controltransistor of the second green pixel.

In one embodiment of the present disclosure, the width-to-length ratioof the first drive transistor corresponding to the first blue pixel,provided by the embodiments of the present disclosure, may be greaterthan the width-to-length ratio of the second drive transistorcorresponding to the second blue pixel; the width-to-length ratio of thefirst drive transistor corresponding to the first red pixel may begreater than the width-to-length ratio of the second drive transistorcorresponding to the second red pixel; and the width-to-length ratio ofthe first drive transistor corresponding to the first green pixel may begreater than the width-to-length ratio of the second drive transistorcorresponding to the second green pixel, where R1>R1′, R2>R2′, andR3>R3′.

Furthermore, the width-to-length ratio of the light-emitting controltransistor corresponding to the first blue pixel may be greater than thewidth-to-length ratio of the light-emitting control transistorcorresponding to the second blue pixel; the width-to-length ratio of thelight-emitting control transistor corresponding to the first red pixelmay be greater than the width-to-length ratio of the light-emittingcontrol transistor corresponding to the second red pixel; and thewidth-to-length ratio of the light-emitting control transistorcorresponding to the first green pixel may be greater than thewidth-to-length ratio of the light-emitting control transistorcorresponding to the second green pixel, thereby improving the stabilityof the first pixel circuit.

It should be understood that, in the embodiments of the presentdisclosure, the width-to-length ratio of the first drive transistorcorresponding to any color pixel is set to be larger than thewidth-to-length ratio of the second drive transistor corresponding tothe same color pixel to increase the drive current generated by thefirst drive transistor; furthermore, the luminous efficiency of thefirst light-emitting element corresponding to the first pixel may beimproved, the overall display brightness at the optical component regionof the display panel may be improved, and the objective of improving theoverall display brightness of the display panel with high uniformity maybe achieved. Optionally, the ratio of the width-to-length ratio of thefirst drive transistor corresponding to any color pixel to thewidth-to-length ratio of the second drive transistor corresponding tothe same color pixel is S, where 3.5≤S≤5.

Furthermore, the width-to-length ratio of the first drive transistorcorresponding to any color pixel provided by the embodiments of thepresent disclosure may be greater than the width-to-length ratio of thesecond drive transistor corresponding to the same color pixel, such thatan expected drive current may be generated by applying a small crossvoltage to the first drive transistor. Therefore, the first pixelcircuit and the second pixel circuit provided by the embodiments of thepresent disclosure may be connected to a same voltage terminal, whichreduces the power consumption of the first pixel circuit while reducingthe wiring difficulty of the display panel. FIG. 8 illustrates astructural schematic of another display panel according to an embodimentof the present disclosure. Any one of the first pixel circuit 120 andthe second pixel circuit 220 provided by the embodiments of the presentdisclosure may include an anode voltage terminal and a cathode voltageterminal. The anode voltage terminal of the first pixel circuit 120 andthe anode voltage terminal of the second pixel circuit 220 may both beelectrically connected to a same voltage terminal PVDD; and the cathodevoltage terminal of the first pixel circuit 120 and the cathode voltageterminal of the second pixel circuit 220 may both be electricallyconnected to a same voltage terminal PVEE.

FIG. 9 illustrates a structural schematic of a transistor channelaccording to an embodiment of the present disclosure. In the first drivetransistor corresponding to the first blue pixel, the first drivetransistor corresponding to the first red pixel, and the first drivetransistor corresponding to the first green pixel, at least a channel 70of the first drive transistor corresponding to the first blue pixel mayhave a rectangular shape, and an expected ratio may be achieved byoptimizing the width W and the length L of the channel 70.

It should be understood that, when the width-to-length ratio of onetransistor provided by the above-mentioned embodiments of the presentdisclosure may be greater than the width-to-length ratio of anothertransistor, (e.g., the width-to-length ratio of the first drivetransistor of the first blue pixel may be greater than each of thewidth-to-length ratio of the first drive transistor of the first redpixel and the width-to-length ratio of the first drive transistor of thefirst green pixel; the width-to-length ratio of the second drivetransistor of the second blue pixel may be greater than each of thewidth-to-length ratio of the second drive transistor of the second redpixel and the width-to-length ratio of the second drive transistor ofthe second green pixel; the width-to-length ratio of the first drivetransistor of the first blue pixel may be greater than thewidth-to-length ratio of the second drive transistor of the second bluepixel, the width-to-length ratio of the first drive transistor of thefirst red pixel may be greater than the width-to-length ratio of thesecond drive transistor of the second red pixel, the width-to-lengthratio of the first drive transistor of the first green pixel may begreater than the width-to-length ratio of the second drive transistor ofthe second green pixel, and the like), the channel shapes may bemodified to achieve the objective of changing the width-to-length ratiosof the transistors. For example, a transistor with a relatively largewidth-to-length ratio may be fabricated with a rectangular channel asshown in FIG. 9, while a transistor with a relatively smallwidth-to-length ratio may be fabricated with a bent channel (e.g.,zigzag shape) as shown in FIG. 10. On the basis of a same channel widthW, compared with the rectangular channel, the length L of the bentchannel may be greater than the length L of the rectangular channel.

Or, on the basis of the same transistor channel shape, in theembodiments of the present disclosure, a manner of increasing thechannel width and reducing the channel length may be used, or a mannerof maintaining the channel width constant while reducing the channellength may be used, or a manner of increasing the channel width andmaintaining the channel length constant may be used, thereby achievingthe objective of increasing the width-to-length ratios of thetransistor, which may not be limited according to an embodiment of thepresent disclosure.

Correspondingly, the present disclosure further provides a displaydevice. The display device provided by the embodiments of the presentdisclosure may include the display panel described in any one of theabove-mentioned embodiments.

FIG. 11 illustrates a structural schematic of a display device accordingto an embodiment of the present disclosure. The display device providedin the embodiments of the present disclosure may be a mobile terminal1000, including the display panel provided in any one of theabove-mentioned embodiments.

It should be noted that the display device provided in the embodimentsof the present disclosure may also be a notebook, a tablet computer, acomputer, a wearable device, and the like, which may not be limitedaccording to an embodiment of the present disclosure.

From the above-mentioned embodiments, it can be seen that the displaypanel and the display device provided by the present disclosure mayachieve at least the following beneficial effects.

The embodiments of present disclosure provide the display panel and thedisplay device. The display region of the display panel may include theoptical component region and the regular display region; and the opticalcomponent region and the regular display region may both includelight-emitting elements, which may make the area of the display regionlarger to meet the full-screen display trend. Moreover, at the opticalcomponent region provided by the embodiments of the present disclosure,the width-to-length ratio of the first drive transistor corresponding tothe first blue pixel may be greater than the width-to-length ratio ofthe first drive transistor corresponding to the first red pixel, and/orthe width-to-length ratio of the first drive transistor corresponding tothe first blue pixel may be greater than the width-to-length ratio ofthe first drive transistor corresponding to the first green pixel,thereby improving the luminous efficiency of the first blue pixel,achieving the objective of improving the chromaticity uniformity of thedisplay panel at the optical component region, and further improving thedisplay effect of the display panel.

The above-mentioned description of the disclosed embodiments may enablethose skilled in the art to implement or use the present disclosure.Various obvious modifications to the embodiments of the presentdisclosure may be made by those skilled in the art, and the generalprinciples defined in the present disclosure may be implemented in otherembodiments without departing from the spirit or scope of the presentdisclosure. Therefore, the present disclosure may not be limited to theembodiments of the present disclosure but should conform to the widestscope consistent with the principles and novel features disclosed in thepresent disclosure.

1. A display panel, comprising: a plurality of pixels, including firstpixels and second pixels, wherein a first pixel includes a firstlight-emitting element and a first pixel circuit, connected to eachother; the first pixel circuit includes a first drive transistor; asecond pixel includes a second light-emitting element and a second pixelcircuit, connected to each other; and the second pixel circuit includesa second drive transistor; and a display region, including an opticalcomponent region and a regular display region, wherein the firstlight-emitting element is in the optical component region; the secondlight-emitting element is in the regular display region; a density ofthe light-emitting element in the optical component region is less thana density of the light-emitting element in the regular display region,wherein: the first pixels include first blue pixels, first red pixels,and first green pixels; a channel width-to-length ratio of a first drivetransistor corresponding to a first blue pixel is R1, a channelwidth-to-length ratio of a first drive transistor corresponding to afirst red pixel is R2, and a channel width-to-length ratio of a firstdrive transistor corresponding to a first green pixel is R3, whereinR1>R2>0 and/or R1>R3>0.
 2. The display panel according to claim 1,wherein: 2≤R1/R2≤4, and/or 2≤R1/R3≤4.
 3. A display panel, comprising: aplurality of pixels, including first pixels and second pixels, wherein afirst pixel includes a first light-emitting element and a first pixelcircuit, connected to each other; the first pixel circuit includes afirst drive transistor; a second pixel includes a second light-emittingelement and a second pixel circuit, connected to each other; and thesecond pixel circuit includes a second drive transistor; and a displayregion, including an optical component region and a regular displayregion, wherein the first light-emitting element is in the opticalcomponent region; the second light-emitting element is in the regulardisplay region; a density of the light-emitting element in the opticalcomponent region is less than a density of the light-emitting element inthe regular display region, wherein: the first pixels include first bluepixels, first red pixels, and first green pixels; a width-to-lengthratio of a first drive transistor corresponding to a first blue pixel isR1, a width-to-length ratio of a first drive transistor corresponding toa first red pixel is R2, and a width-to-length ratio of a first drivetransistor corresponding to a first green pixel is R3, wherein R1>R2>0and/or R1>R3>0, a channel width of the first drive transistorcorresponding to the first red pixel is W2, a channel width of the firstdrive transistor corresponding to the first green pixel is W3, a channellength of the first drive transistor corresponding to the first redpixel is L2, and a channel length of the first drive transistorcorresponding to the first green pixel is L3, wherein |W2-W3|≤0.5 μm,and |L2-L3|≤0.5 μm.
 4. The display panel according to claim 1, wherein:the first pixel circuit includes a reset module, a data write module,and a light-emitting control module which are electrically connected tothe first drive transistor; the reset module includes at least one resettransistor electrically connected to the first drive transistor; thedata write module includes at least one data write transistorelectrically connected to the first drive transistor; and thelight-emitting control module includes at least one light-emittingcontrol transistor electrically connected to the first drive transistor;and a channel width-to-length ratio of a light-emitting controltransistor corresponding to the first pixel circuit is greater than eachof channel width-to-length ratios of the reset transistor and the datawrite transistor in a same first pixel circuit.
 5. The display panelaccording to claim 4, wherein: the first pixel circuit further includesa black state maintaining module electrically connected to the firstlight-emitting element, and the black state maintaining module includesat least one black state maintaining transistor electrically connectedto the first light-emitting element; and the channel width-to-lengthratio of the light-emitting control transistor corresponding to thefirst pixel circuit is greater than a channel width-to-length ratio ofthe black state maintaining transistor in a same first pixel circuit. 6.The display panel according to claim 4, wherein: a channelwidth-to-length ratio of a light-emitting control transistorcorresponding to the first blue pixel is R_(k)1; a channelwidth-to-length ratio of a light-emitting control transistorcorresponding to the first red pixel is R_(k)2; and a channelwidth-to-length ratio of a light-emitting control transistorcorresponding to the first green pixel is R_(k)3, wherein when R1>R2>0,R_(k)1>R_(k)2>0; and when R1>R3>0, R_(k)1>R_(k)3>0.
 7. The display panelaccording to claim 4, wherein: the channel width-to-length ratio of thelight-emitting control transistor corresponding to the first pixelcircuit is R_(k), wherein 4≤R_(k)≤6.
 8. The display panel according toclaim 1, wherein: the first pixel circuit includes a first storagecapacitor electrically connected to a gate electrode of the first drivetransistor; the second pixel circuit includes a second storage capacitorelectrically connected to a gate electrode of the second drivetransistor; and a capacitance of the first storage capacitor is greaterthan a capacitance of the second storage capacitor.
 9. The display panelaccording to claim 8, wherein: the capacitance of the first storagecapacitor is C1, and the capacitance of the second storage capacitor isC2, wherein 2≤C1/C2≤4.
 10. The display panel according to claim 1,wherein: the second pixels include second blue pixels, second redpixels, and second green pixels; a channel width-to-length ratio of asecond drive transistor corresponding to a second blue pixel is R1′, achannel width-to-length ratio of a second drive transistor correspondingto a second red pixel is R2′, and a channel width-to-length ratio of asecond drive transistor corresponding to a second green pixel is R3′,wherein R1′>R2′>0 and/or R1′>R3′>0.
 11. The display panel according toclaim 10, wherein: a channel width of the second drive transistorcorresponding to the second red pixel is W2′, a channel width of thesecond drive transistor corresponding to the second green pixel is W3′,a channel length of the second drive transistor corresponding to thesecond red pixel is L2′, and a channel length of the second drivetransistor corresponding to the second green pixel is L3′, wherein|W2′-W3′|≤0.5 μm, and |L2′-L3′|≤0.5 μm.
 12. The display panel accordingto claim 10, wherein: R1>R1′, R2>R2′, and R3>R3′.
 13. The display panelaccording to claim 12, wherein: a ratio of a channel width-to-lengthratio of the first drive transistor corresponding to any color pixel toa channel width-to-length ratio of the second drive transistorcorresponding to a same color pixel is S, wherein 3.5≤S≤5.
 14. Thedisplay panel according to claim 12, wherein: any one of the first pixelcircuit and the second pixel circuit includes an anode voltage terminaland a cathode voltage terminal, wherein: the anode voltage terminal ofthe first pixel circuit and the anode voltage terminal of the secondpixel circuit are both electrically connected to a same voltageterminal; and the cathode voltage terminal of the first pixel circuitand the cathode voltage terminal of the second pixel circuit are bothelectrically connected to a same voltage terminal.
 15. The display panelaccording to claim 1, wherein: in the first drive transistorcorresponding to the first blue pixel, the first drive transistorcorresponding to the first red pixel, the first drive transistorcorresponding to the first green pixel, at least the first drivetransistor corresponding to the first blue pixel has a channel in arectangular shape.
 16. A display device, comprising: a display panel,comprising: a plurality of pixels, including first pixels and secondpixels, wherein a first pixel includes a first light-emitting elementand a first pixel circuit, connected to each other; the first pixelcircuit includes a first drive transistor; a second pixel includes asecond light-emitting element and a second pixel circuit, connected toeach other; and the second pixel circuit includes a second drivetransistor; and a display region, including an optical component regionand a regular display region, wherein the first light-emitting elementis in the optical component region; the second light-emitting element isin the regular display region; a density of the light-emitting elementin the optical component region is less than a density of thelight-emitting element in the regular display region, wherein: the firstpixels include first blue pixels, first red pixels, and first greenpixels; a channel width-to-length ratio of a first drive transistorcorresponding to a first blue pixel is R1, a channel width-to-lengthratio of a first drive transistor corresponding to a first red pixel isR2, and a channel width-to-length ratio of a first drive transistorcorresponding to a first green pixel is R3, wherein R1>R2>0 and/orR1>R3>0.
 17. The display device according to claim 16, wherein: thefirst pixel circuit includes a reset module, a data write module, and alight-emitting control module which are electrically connected to thefirst drive transistor; the reset module includes at least one resettransistor electrically connected to the first drive transistor; thedata write module includes at least one data write transistorelectrically connected to the first drive transistor; and thelight-emitting control module includes at least one light-emittingcontrol transistor electrically connected to the first drive transistor;and a channel width-to-length ratio of a light-emitting controltransistor corresponding to the first pixel circuit is greater than eachof channel width-to-length ratios of the reset transistor and the datawrite transistor in a same first pixel circuit.
 18. The display deviceaccording to claim 16, wherein: the first pixel circuit includes a firststorage capacitor electrically connected to a gate electrode of thefirst drive transistor; the second pixel circuit includes a secondstorage capacitor electrically connected to a gate electrode of thesecond drive transistor; and a capacitance of the first storagecapacitor is greater than a capacitance of the second storage capacitor.19. The display device according to claim 16, wherein: the second pixelsinclude second blue pixels, second red pixels, and second green pixels;a channel width-to-length ratio of a second drive transistorcorresponding to a second blue pixel is R1′, a channel width-to-lengthratio of a second drive transistor corresponding to a second red pixelis R2′, and a channel width-to-length ratio of a second drive transistorcorresponding to a second green pixel is R3′, wherein R1′>R2′>0 and/orR1′>R3′>0.
 20. The display device according to claim 19, wherein:R1>R1′, R2>R2′, and R3>R3′.